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The Biology of Insularity: an Introduction Donald R Journal of Biogeography, 29, 563–569 The biology of insularity: an introduction Donald R. Drake1*, Christa P. H. Mulder2, David R. Towns3 and Charles H. Daugherty4 1Botany Department, University of Hawaii, Maile Way, Honolulu, HI, USA, 2Institute of Arctic Biology and Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks AK, USA, 3Department of Conservation, Auckland, New Zealand, and 4School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand Summary of special issue Insular environments, ranging from oceanic islands to fragments of once-contiguous natural systems, have long been used by biologists to test basic principles of ecology, evolution and biogeography. More recently, insular environments have figured prom- inently in conservation ecology, where the aim has usually been to conserve species or assemblages unique to isolated habitats. Improving the level of communication among the evolutionary biologists, theoretical ecologists and conservation biologists who study insular biotas will work to the benefit of all. This volume was inspired by a recent conference on the ecology of insular biotas, in which participants from a wide range of disciplines came together to compare ecological processes across a variety of taxonomic groups inhabiting a wide range of isolated environments. In this introduction, we point out the themes underlying these very diverse contributions. First we elaborate on the value of islands for elucidating processes underlying ecosystem functioning, population dynamics of reintroduced species, and restoration of disturbed habitats, and emphasize those areas where the use of islands could be expanded. The second section focuses on the link between ecology and evolutionary processes in insular systems and includes examples from oceanic islands, naturally patchy habitats and recently fragmented habitats. The third section illustrates some of the ways that invasive alien species on oceanic islands affect plant–animal mutualisms, particularly seed dispersal and pollin- ation. The final section, on consequences of habitat fragmentation, focuses mainly on studies that describe the consequences that fragmentation has for plants and animals as they are forced into artificially insular environments. We close with a study that points out the differences among types of insular systems and identifies gaps in our knowledge of insular biotas, particularly the importance of explicitly incorporating patch type, age and patch–matrix contrasts in research. Finally, we recommend a greater emphasis on linking ecological theory and applied research, and improving communication between those who ask basic ecological questions and those who use insular systems for conservation. Keywords Biodiversity, conservation, evolution, habitat fragmentation, insular ecosystems, inva- sive alien species, islands, island biogeography, plant–animal interactions, restoration. organisms vary in their response to this environmental INTRODUCTION change (Lomolino, 2000). Biogeography is the study of the geographical patterns of The study of insular systems, especially islands, has species distribution (Quammen, 1996). These patterns are provided fundamental insights into the relationships influenced by two features. First, environmental conditions between geographical patterns and biological processes for change predictably along spatial gradients, and second, at least 150 years, by inspiring scientists such as Darwin, Wallace, Mayr, Wilson and Diamond. In turn, many island systems both small, such as Mauritius, Krakatau, Hawai’i *Correspondence: Botany Department, University of Hawaii, 3190 Maile and the Gala´pagos, and large, such as Madagascar, New Way, Honolulu, HI 96822, USA. E-mail: [email protected] Ó 2002 Blackwell Science Ltd 564 D. R. Drake et al. Zealand and Australia, have become icons for biologists. (2002). He reviews island studies that have given insight into Also inspirational, if less well known, have been other the roles of trophic interactions and the role of biodiversity, patches of habitat surrounded by a contrasting environmen- including results of an excellent example of this approach tal matrix – such as Lake Baikal, Mt Kilimanjaro and deep using small islands in a lake in northern Sweden (Wardle sea hydrothermal vents. Recently, anthropogenic habitat et al., 1997). On these islands there is a strong correlation islands created through fragmentation of formerly contigu- between island size and successional stage of the vegetation ous habitats have received increasing attention as the simply because of the greater probability of lighting striking ecological scope and consequences of fragmentation have the larger islands and inducing wildfires. This resulted in expanded. strong relationships, mediated through differences in suc- Although islands in the sea, other habitat islands, and cessional stage, between island size and ecosystem variables fragments are all insular by virtue of their geographical and/ such as carbon sequestration, decomposition rates and or ecological isolation from similar environments, they are nitrogen acquisition. nonetheless quite diverse. For example, they vary in acces- Towns’ (2002) study illustrates the potential for using sibility, size, age, permanence, habitat complexity and islands to guide restoration efforts. He evaluates the antici- degree of contrast with the surrounding matrix (MacArthur pated restoration trajectory of New Zealand’s Korapuki & Wilson, 1967; Whittaker, 1998; Ricketts, 2001; Watson, Island, which has been heavily disturbed by introduced rats 2002). Yet researchers have sometimes been tempted to treat and rabbits, using as ‘benchmarks’ two nearby islands that all insular systems as functionally similar, for example by are very similar in climate and vegetation but lack rats and uncritically applying island biogeography theory to the rabbits. He presents several potential restoration scenarios design of nature reserves (Simberloff & Abele, 1982). These and emphasizes the importance of considering the life-spans attempts have revealed that we must examine the phenom- of affected plant and animal species in predicting recovery enon of insularity in greater detail if we wish to make rates. Comparisons with adjacent islands allow for a focused generalizations about how it structures biological diversity evaluation of whether restoration is successful, and whether (Lomolino, 2000; Watson, 2002). As a step towards the results can then be applied to other areas, including understanding the effects of insularity, we convened a mainland habitats. conference on the ‘Ecology of Insular Biotas’ in 2001 The value of islands to understanding population dynam- (Denslow, 2001), attended by 170 scientists from a broad ics is demonstrated by Armstrong et al. (2002) in their study range of disciplines. This special issue contains selected of three bird species reintroduced to New Zealand islands. contributions from these conference participants. The papers They compare island manipulations to microcosm experi- are grouped into four overlapping categories that reflect ments: starting conditions are known, the entire system can contemporary influences on the interplay between process be monitored, and the population is essentially closed to and pattern in insular systems: ecological processes, evolu- immigration and emigration. This allows them to distinguish tionary processes, invasive alien species and habitat frag- factors controlling population size in a manner not possible mentation. at most mainland sites. These factors differ among species and islands, and may include food limitation and disease. These results reinforce the importance of species-specific and ECOLOGICAL PROCESSES IN INSULAR site-specific variables in determining the success of restor- SYSTEMS ation efforts. Islands have been treated as ‘model systems’ through which Islands are not only useful tools for evaluating restor- to understand ecological and evolutionary processes since ation attempts, but they may also have a high intrinsic Darwin landed on the Gala´pagos and Wallace explored the conservation value: they often contain unique species Malay archipelago (see reviews in Vitousek et al., 1995; assemblages because of species impoverishment, and they Quammen, 1996). In the opening paper of this section, may harbour remnant populations of species that have been Vitousek (2002) compares the use of islands in ecology to eliminated from mainland areas by introduced predators that of model organisms in other fields of biology, and (Daugherty et al., 1990). Rodda & Dean-Bradley (2002) reviews recent contributions of island studies to our under- combine a thorough literature review with results from standing of ecosystem processes. His emphasis is on a long their own studies to examine the hypothesis that herpe- series of studies of the islands of Hawai’i that evaluated the tofaunal assemblages on islands demonstrate ‘excess density roles of temperature, precipitation and long-distance dust compensation’ (greater aggregate biomass per area) com- transfer in nutrient cycling and decomposition. Vitousek pared with mainland areas. They find clear support for points out that although oceanic islands have been used very excess density compensation on small islands, including the effectively to answer questions in evolution and speciation as example provided by Nelson et al. (2002), who found well as ecosystem ecology, they are greatly underutilized in extraordinarily high densities
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